Several email providers provide catch-all/wildcard functionality which can handle arbitrary tagging. https://www.fastmail.help/hc/en-us/articles/1500000277942-

Several email providers provide catch-all/wildcard functionality which can handle arbitrary tagging. https://www.fastmail.help/hc/en-us/articles/1500000277942-Catch-all-wildcard-aliases https://www.fastmail.help/hc/en-us/articles/1500000277942-Ca... https://help.zoho.com/portal/en/community/topic/receive-only-wildcard-aliases https://help.zoho.com/portal/en/community/topic/receive-only... https://support.google.com/a/answer/12943537?hl=en https://support.google.com/a/answer/12943537?hl=en